Deck 3: Shop Math

Question 1

Decimal fractions are added and subtracted just like whole numbers as long as the decimal points are kept in a vertical line.

Answer 1

True

Question 2

A decimal fraction is a number that uses a decimal point to denote a unit that is larger than 1.

Answer 2

False

Question 3

When a formula has more than one mathematical operation, first do all addition and subtraction working from left to right.

Answer 3

False

Question 4

Dividing is the same thing as adding the same number to itself over and over.

Question 5

Pounds and ounces are mixed units, which can be reduced by dividing the ounces by ____.

A) 4
B) 8
C) 12
D) 16

Question 6

Fractions often cannot be added, subtracted, multiplied, or divided without first having to make some type of ____.

A) equation
B) truncating
C) conversion
D) rounding

Question 7

When adding multiple mixed numbers, add all of the inches first and then all of the feet.

Question 8

How many feet of scrap pipe you have left from a 7 ft 8 in. piece when 5 ft 5 in. is cut off?

A) 2' 3"
B) 3' 2"
C) 3' 4"
D) 12' 3"

Question 9

Converting 2 3/4 in. to millimeters will round off to ____.

A) 60 mm
B) 65 mm
C) 70 mm
D) 75 mm

Question 10

The area of a piece of metal that is 3/4 in. long by 7/8 in. wide is 5/6.

Question 11

When a formula has more than one mathematical operation, first ____.

A) resolve any derivatives
B) perform all operations within parentheses
C) do all multiplication and division working from left to right
D) do all addition and subtraction working from left to right

Question 12

The amount by which a part can be larger or smaller than the stated dimensions and still be acceptable is known as ____.

A) dimension
B) tolerance
C) round off
D) fraction

Question 13

Rounding off 15.6549 to the second decimal place, we obtain 15.66.

Question 14

Fractions smaller than 1/16 of an inch, such as 1/32 and 1/64 of an inch, are not commonly used in fabrication.

Question 15

When dividing numbers, we often get a whole number followed by a long decimal fraction.

Question 16

To add 1/2 and 1/16 where both denominators are different, you must first find the common denominator. In this case, it is ____.

A) 32
B) 16
C) 8
D) 2

Question 17

How many 1/4-in. pieces could be cut out of a 3/4-in. piece of metal?

A) 0
B) 1
C) 2
D) 3

Question 18

Almost all welding shop dimensioning uses ____.

A) the metric system
B) truncating
C) radicals
D) mixed units

Question 19

An example of a welding fabrication decimal fraction problem would be to find the total length of two pieces of pipe when one is 5.5 ft and the other is 2.25 ft.

Question 20

Whole numbers are numbers used to express units in increments of ____.

A) 1
B) 10
C) 100
D) 1000

Question 21

The most common use of math in welding fabrication is for ____________________.

Question 22

To reduce any inches equal to or larger than 12 in. to feet and inches you divide the inches by ____________________.

Question 23

Subtract 5/8 from 7/8: ____________________.

Question 24

To convert a fraction to a decimal, divide the numerator by the ____________________.

Question 25

To subtract 2 lb 10 oz from 4 lb 8 oz, you have to convert 1 lb to 16 oz and add that to the ____________________ oz.